I was recently asking a similar question and most people here seem to be happy with the Tamron 28-75 2.8 lens. At under $400, it seems like the most bang for the buck. The L glass is nice but much more pricey. What are you shooting with now?

Hi Patrick,
Right now I've been bouncing back and fourth between the Sigma 24-70 and the Canon 24-85. But I want to take things to the next level of sharpness. I'm just really not getting the sharpness in the eyes that I want.

I also think I may need to send my camera in to have it serviced. It has hit the concrete a couple of time. Thank goodness for the metal body.